Medical tool for fingertip

ABSTRACT

A medical tool for fingertip of the present invention has a resin layer that emits red fluorescence or near-infrared fluorescence, and is used by putting it on a fingertip. More specifically, the medical tools for fingertip 1A to 1E have a finger cot shape and an opening portion 2 from which the ball of the finger is exposed when put on, and are formed of a resin that emits red fluorescence or near-infrared fluorescence. Alternatively, the medical tools for fingertip 1F and 1G have a globe shape, and a printing layer 8, 9 that is formed of a resin that emits red fluorescence or near-infrared fluorescence on or around the ball of the finger thereof. Further alternatively, the medical tools for fingertip 1H and 1I are a sticker-like medical tool having an adhesive layer provided to one surface of the resin layer that emits red fluorescence or near-infrared fluorescence, and have a size that allows it to be attached to the ball of the finger. When the medical tools for fingertip are put on the tip of a finger of a surgeon used for palpation of a living body, the position of an affected site which has been specified from the mucosal side by the palpation can be accurately specified from the serosal side.

TECHNICAL FIELD

The present invention relates to a medical tool for fingertip includinga resin layer that emits red or near-infrared fluorescence and is put ona fingertip.

BACKGROUND ART

An endoscope is used to diagnose cancer or the like developed in themucosa of a human tubular tissue such as the rectum. The diagnosis isperformed in combination with palpation in which a finger of the surgeonis inserted into the body. Regarding this, a finger cot, provided withan opening portion for palpation on the tip and with an image-capturingdevice attached to the tip, has been proposed (Patent Literature 1).

CITATION LIST Patent Literature

Patent Literature 1: Japanese Patent Application Laid-Open No.2002-291746

SUMMARY OF INVENTION Technical Problem

The finger cot described in Patent Literature 1 is put on a finger, thenthe finger is inserted into a human tubular tissue such as the rectum.This makes it possible to observe the surface state of the human tubulartissue on the mucosal side and perform palpation of the tissue on themucosal side. Further, in a case where a resection treatment of canceris required, a puncture treatment can be performed while the affectedsite is being observed.

On the other hand, surgical resection of cancer developed in the mucosaof the human tubular tissue requires the position of the cancer to bespecified from the serosal side of the human tubular tissue. However,the position of the cancer cannot be specified from the serosal side byusing the finger cot described in Patent Literature 1. Thus, forexample, in a case where rectal cancer is diagnosed by an endoscope orpalpation, the resection is generally performed with a margin range ofabout 2 cm around the position of the diagnosed cancer. Having such amargin range sometimes results in the removal of the sections of theanus where the presence of cancer is not confirmed, leading to thenecessity for an artificial anus.

Regarding the abovementioned problems, an object of the presentinvention is to specify, if a medical doctor specifies a position of anaffected site by performing palpation of the mucosa of a human tubulartissue such as the rectum, the position of the affected site from theserosal side of the human tubular tissue.

Solution to Problem

The present inventor has conceived that, when a resin layer that emitsred fluorescence or near-infrared fluorescence is put on the tip of afinger used for palpation, the position of an affected site which hasbeen specified from the mucosal side by the palpation can be specifiedfrom the serosal side by observing the fluorescence emitted by the resinlayer from the serosal side, thereby completing the present invention.

That is, the present invention provides a medical tool for fingertip,which is used by putting it on a fingertip, having a resin layer thatemits red fluorescence or near-infrared fluorescence.

Advantageous Effects of Invention

According to the present invention, the resin layer that emits redfluorescence or near-infrared fluorescence can be put on a fingertip,making it possible to specify the position of the affected site from theserosal side, which has been specified by the palpation from the mucosalside, by observing the fluorescence emitted by the resin layer. Thus,when the affected site specified by the palpation from the mucosal sideis surgically resected, the margin of the resection range required dueto not being able to accurately specify the position of the affectedsite can be significantly reduced or eliminated, thereby minimizing theresection range. As a result, a section of the anus, which would havebeen unnecessarily removed before, can be conserved, for example,reducing the burden of the patient.

Further, palpation can be performed according to the present invention,and thus the size of the cancer or the like can be accurately diagnosedon the basis of the hardness of the mucosa.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an elevation view of a medical tool for fingertip 1A ofExample having a finger cot shape.

FIG. 2A is an explanatory view of a position of an affected site in thebody in a case where the affected site is in the rectum.

FIG. 2B is an explanatory view of a method for specifying the positionof the affected site in the rectum by the medical tool for fingertip 1Aof Example.

FIG. 3 is a perspective view of a medical tool for fingertip 1B ofExample.

FIG. 4 is a perspective view of a medical tool for fingertip 1C ofExample.

FIG. 5 is a perspective view of a medical tool for fingertip 1D ofExample.

FIG. 6 is a perspective view of a medical tool for fingertip 1E ofExample.

FIG. 7 is a perspective view of a medical tool for fingertip 1F ofExample.

FIG. 8 is a perspective view of a medical tool for fingertip 1G ofExample.

FIG. 9A is a perspective view of a medical tool for fingertip 1H ofExample.

FIG. 9B is a perspective view of the medical tool for fingertip 1H ofExample in a state of being attached to a glove.

FIG. 10A is a perspective view of a medical tool for fingertip 1I ofExample.

FIG. 10B is a perspective view of the medical tool for fingertip 1I ofExample in a state of being attached to a glove.

FIG. 11A is an image of the medical tool for fingertip 1A of Examplecaptured under white illumination light using a digital color camera.

FIG. 11B is an image of a front surface of a silicone sheet behind whichthe medical tool for fingertip 1A of Example is placed, the image beingcaptured under white illumination light using the digital color camera.

FIG. 11C is an image of the front surface of the silicone sheet behindwhich the medical tool for fingertip 1A of Example is placed, the frontsurface being irradiated with excitation light and imaged using anear-infrared color system.

DESCRIPTION OF EMBODIMENTS

Hereinafter, the present invention will be described in detail withreference to drawings. Note that, in each of the drawings, the samereference symbols indicate the same or equivalent constituent elements.

(Medical Tool for Fingertip with Finger Cot Shape)

FIG. 1 is an elevation view of a medical tool for fingertip 1A of oneexample of the present invention with a finger cot shape. In FIG. 1, abroken line indicates a hand having the medical tool for fingertip 1Awith a finger cot shape put on a finger. As shown, the medical tool forfingertip of the present invention is configured such that a resin layerthat emits red fluorescence or near-infrared fluorescence is put on afingertip, in particular, on the ball of a finger or around the ball ofa finger. More specifically, the medical tool for fingertip 1A has alength to cover the finger from the fingertip to the first joint of thefinger when put on and includes an opening portion 2 from which at leasta center portion of the ball of the finger is exposed. Including theopening portion 2 allows a surgeon to easily perform palpation using theball of the finger exposed from the opening portion 2.

As of the size of the opening portion 2, a width w1 is preferably set to5 to 15 mm and a length h1 is preferably set to 5 to 20 mm from thestandpoint of allowing palpation. On the other hand, as described below,when the opening portion of the medical tool for fingertip 1A is placedon an affected site of the human tissue on the mucosal side and then theexcitation light is applied to the affected site, the resin layer of themedical tool for fingertip 1A emits fluorescence. When such afluorescent image is observed from the serosal side, the opening portion2 is observed as being dark and the periphery of the opening portion 2is observed as being bright in a ring shape, making it possible tospecify the position of the opening portion, that is, the position ofthe affected site. Thus, from the standpoint of specifying the positionof the affected site more accurately, the width w1 of the openingportion 2 is preferably set to 10 to 15 mm and the length h1 of theopening portion 2 is preferably set to 10 to 20 mm. On the other hand,if the size of the opening portion 2 is too small, the light-emittingpart observed from the serosal side fails to form a ring shape and thepart corresponding to the opening portion 2 looks as if it is emittinglight, making it difficult to accurately specify the position of theaffected site. Conversely, if the size is too large, it becomesdifficult to specify which part of the area observed as being dark isthe affected site.

(Resin Forming Medical Tool for Fingertip)

The medical tool for fingertip 1A has a resin layer that is formed of aresin that emits red fluorescence or near-infrared fluorescence. As theresin that emits red fluorescence or near-infrared fluorescence, forexample, a flexible resin in which a fluorescence dye is kneaded can beused. As the flexible resin described herein, polyurethane,polypropylene, polyethylene, polyvinyl chloride, polyamide, polyamideelastomer, or the like compounded with a curing agent as necessary, canbe used. The resin preferably has the shore hardness of from 30A to 70Aafter curing. Further, using the resin having the elongation at break of300% or more causes excellent fit feeling that comes when the medicaltool for fingertip 1A having a finger cot shape is put on the fingertip.

The preferable thickness of the resin layer forming a finger cot shapeis determined according to the emission intensity of the resin layercontaining the fluorescence dye. Thus, the preferable thickness of theresin layer varies according to a type and concentration of thefluorescence dye. However, normally, the thickness is preferably from0.1 to 2 mm.

(Fluorescence Dye)

The fluorescence dye kneaded in the flexible resin preferably emitsfluorescence in a red-to-near-infrared wavelength region of from 600 to1400 nm, preferably in a red or near-infrared light wavelength region offrom 700 to 1100 nm. Light of such a wavelength region has a hightransmittance into human tissues such as skin, fat, and muscle, and, forexample, it can satisfactorily reach from the mucosa to the serosalsurface of the human tubular tissue such as the rectum.

Examples of the fluorescence dye that emits the fluorescence in theabovementioned wavelength region may include riboflavin, thiamine,nicotinamide adenine dinucleotide (NADH), indocyanine green (ICG),azo-boron complexes compound described in Japanese Patent ApplicationLaid-Open No. 2011-162445, and dyes containing a condensed ringstructure described in WO2016/132596.

A preferable concentration of the fluorescence dye in the resin thatemits near-infrared fluorescence is determined according to a type andthe like of the fluorescence dye and the resin as a binder. Normally,the concentration is preferably determined in a range of from 0.001 to1% by mass.

Examples of a method of incorporating the fluorescence dye in theflexible resin may include a method in which the fluorescence dye iskneaded in the resin by using a biaxial kneader. Then, the kneadedproduct is molded into a finger cot shape by extrusion molding orinjection molding.

(Additives)

A contrast agent such as barium sulfate may be added to the fluorescentresin as needed. In this case, even if the medical tool for fingertip 1Acomes off from the finger in the living body, the medical tool forfingertip 1A can be tracked in the living body by using X-rayphotography.

(Using Method of Medical Tool for Fingertip)

A method of using the medical tool for fingertip 1A involves, first,putting the medical tool for fingertip 1A having a finger cot shape on afinger of a surgeon's hand, preferably a surgeon's hand wearing asurgical glove as illustrated in FIG. 1, in order to specify a positionX of the rectal cancer illustrated in FIG. 2A from the serosal side, forexample. In this case, the opening portion 2 is placed on the ball ofthe finger.

Next, as illustrated in FIG. 2B, the finger wearing the medical tool forfingertip 1A having a finger cot shape is inserted in the rectum fromthe anus to perform palpation of the rectum, thereby specifying theposition of the cancer. The cancer is pressed down by the ball of thefinger exposed from the opening portion 2. Then, excitation light forcausing emission of red fluorescence or near-infrared fluorescence isapplied to the resin forming the medical tool for fingertip 1A from theserosal side of the rectum, and the fluorescence emitted from themedical tool for fingertip 1A is observed from the serosal side.

In this operation, an irradiation method of the excitation light mayinvolve irradiating the serosa of the rectum, which has been exposed bythe abdominal surgery, with the excitation light or irradiating the sitefrom the serosal side after a surgical endoscope is inserted from anincision made in the wall of the abdomen. The wavelength of theexcitation light is shorter than that of the fluorescence. However, thewavelength region of the excitation light causing emission of redfluorescence or near-infrared fluorescence also has a high transmittancethrough human tissue. Thus, the excitation light applied from theserosal side is absorbed by the medical tool for fingertip 1A on themucosal side with it barely being absorbed by or interfered by thetissue of the rectum or the blood, thereby causing the resin layer ofthe medical tool for fingertip 1A to emit red fluorescence ornear-infrared fluorescence. As a result, the ring shape emission fromthe medical tool for fingertip 1A can be easily observed from theserosal side, in a case of red fluorescence, by naked eyes, and, in acase of near-infrared fluorescence, through a known infrared-to-visiblelight conversion glass or by imaging the rectum from the serosal sideand visualizing the near-infrared fluorescence by image processing.Further, the dark part caused by the opening portion 2 inside thering-shaped emission part can be specified as the position of thedeveloping cancer. When the position of the cancer can be specified fromthe serosal side in this manner, the position of the cancer is marked byan electric scalpel, so that such a mark can be used as a guide duringresection of the affected site.

A situation where the medical tool for fingertip 1A of the presentinvention is applied is not limited to the case where the position ofthe affected site to be specified is within a range where the fingerinserted from the outside of the human body can reach as described abovewith the rectum. For example, it can be used in a case where the fingerwearing the medical tool for fingertip 1A is inserted in an incisionmade in the wall of the abdomen for inserting a laparoscope and asurgical instrument and then further inserted in the gastric cavity froman incision made in the stomach wall to specify the position of theaffected site in the gastric mucosa from the gastric serosal side.

Note that, for example, when a metal clip described in Japanese PatentNo. 6161096 is used to pinch the mucosa of the affected site, theposition of the affected site can be specified by observing the affectedsite from the serosal side using the emission of the fluorescencedye-containing resin attached to the clip. However, scalpels may bedamaged by colliding with the metal clip during the resection of theaffected site. In contrast, according to the medical tool for fingertipof the present invention, even if the medical tool for fingertip comesoff the finger of the surgeon in the living body and the scalpelcollides with the medical tool for fingertip during the resection of theaffected site, no damage is caused to the scalpel.

(Modified Embodiment of Medical Tool for Fingertip)

The medical tool for fingertip of the present invention can be providedin various embodiments. For example, a medical tool for fingertip 1Billustrated in FIG. 3 is obtained by attaching a pull string 3 to an endportion of the medical tool for fingertip 1A illustrated in FIG. 1 byadhesion or welding. Even if the medical tool for fingertip 1B attachedwith the pull string 3 comes off from the fingertip in the body, themedical tool for fingertip 1B can be easily taken out from the body bypinching and pulling the pull string 3.

Note that, in order to firmly attach the pull string 3 to a medical toolmain body for fingertip 1, it is preferable to maintain a sufficientlength of an attachment region 3 a of the pull string 3.

A medical tool for fingertip 1C illustrated in FIG. 4 is configured insuch a manner that the length of the medical tool for fingertip 1Aillustrated in FIG. 1 is extended, so that it covers the finger from thefingertip to the second joint, and scales 4 are provided at prescribedintervals on the lower side from the opening portion 2 (that is, afinger insertion side) using a red or near-infrared lightnontransmitting resin. In this configuration, when the medical tool forfingertip 1C on the mucosal side is observed from the serosal side, theopening portion 2 and the scales 4 are observed as dark areas in thelight-emitting region with a finger cot shape, making it possible to usethe scales as a guide for determining an resection margin of theaffected site.

A medical tool for fingertip 1D illustrated in FIG. 5 is configured insuch a manner that, instead of forming the scales using the red ornear-infrared light nontransmitting resin in the medical tool forfingertip 1C illustrated in FIG. 4, a red or near-infrared lightnontransmitting resin layer is provided by attaching a red ornear-infrared light nontransmitting resin film 6, including holes 5punched out in a shape of scales, to the medical tool main body 1,printing the red or near-infrared light nontransmitting resin layer onthe medical tool main body 1, or the like. The resin that emits red ornear-infrared fluorescence is exposed from the holes 5, thus, when theexcitation light is applied and the medical tool for fingertip 1D isobserved from the serosal side, the opening portion 2 is observed as adark area in the light-emitting region with a finger cot shape on thefingertip side of the medical tool for fingertip 1D put on the finger,while the scales emitting light in the dark region can be observed onthe lower side of the opening portion.

A medical tool for fingertip 1E illustrated in FIG. 6, like the medicaltool for fingertip 1C illustrated in FIG. 4, has a shape of the fingercot including the opening portion 2 and has a length to cover the fingerfrom the fingertip to the second joint. However, the shape of the fingercot itself is formed by a resin 15 without the fluorescence dye thatemits red fluorescence or near-infrared fluorescence. On the other hand,a resin layer 8 having a ring shape is formed around the opening portion2 by applying a coating material containing the fluorescence dye thatemits red fluorescence or near-infrared fluorescence. Further, thescales 4 are formed on the lower side of the opening portion 2 by thecoating material containing the fluorescence dye that emits redfluorescence or near-infrared fluorescence. This medical tool forfingertip 1E can be used in the same manner as the medical tool forfingertip 1C illustrated in FIG. 4.

In a case where the medical tool for fingertip of the present inventionis formed in the finger cot shape having the opening portion asdescribed above, as an aspect of forming a medical tool for fingertipusing a resin that emits red fluorescence or near-infrared fluorescence,it only requires that at least the periphery of the opening portion beformed by the resin that emits red fluorescence or near-infraredfluorescence. Thus, the entire finger cot shape may be formed by such aresin as in the medical tool for fingertip 1A illustrated in FIG. 1.Alternatively, the resin layer 8 that emits red fluorescence ornear-infrared fluorescence may be formed around the opening portion 2 asa coating layer as in the medical tool for fingertip 1E illustrated inFIG. 6.

A medical tool for fingertip 1F illustrated in FIG. 7 has a glove shapeand this glove 7 includes a printing layer 8 having a ring shape formedby a resin that emits red or near-infrared fluorescence in a partcorresponding to the ball of the forefinger. This printing layer 8having a ring shape is formed so as to surround the center part of theball of the finger.

As the glove 7, a common surgical glove made of natural rubber orsynthetic rubber can be used.

According to this medical tool for fingertip 1F, the position of theaffected site is specified by palpation using the fingertip, where theprinting layer 8 having a ring shape is placed, of the hand wearing themedical tool for fingertip 1F. Then, the excitation light is appliedfrom the serosal side to cause the printing layer 8 having a ring shapeto emit red or near-infrared fluorescence. The fluorescence thus emittedis observed from the serosal side in the same manner as that in themedical tool for fingertip 1A illustrated in FIG. 1, so that theaffected site can be accurately specified as a dark part inside thelight-emitting part having a ring shape formed by the printing layer 8.

A medical tool for fingertip 1G illustrated in FIG. 8 is obtained insuch a manner that, instead of including the printing layer 8 having aring shape formed by the resin that emits red fluorescence ornear-infrared fluorescence in the medical tool for fingertip 1F having aglove shape illustrated in FIG. 7, a circular printing layer 9 formed bythe same resin is provided. According to this medical tool for fingertip1G, the affected site can be accurately specified as a circularlight-emitting part by observing the fluorescence light-emitting partfrom the serosal side in the same manner as that in the medical tool forfingertip 1A illustrated in FIG. 1.

A medical tool for fingertip 1H illustrated in FIG. 9A is a sticker-likemedical tool for fingertip in which, like the printing layer 8 having aring shape illustrated in FIG. 7, a resin layer 10 having a ring shapeis formed by the resin that emits the red fluorescence or thenear-infrared fluorescence, and an adhesive layer is provided to onesurface of the resin layer 10 and then attached to a release film 11.

The resin layer 10 of the sticker-like medical tool for fingertip 1Hpreferably has a size that allows the resin layer 10 to be attached tothe ball of the finger. In this configuration, the medical tool forfingertip 1H is released from the release film 11 and the resin layer 10having a ring shape is attached to a surgical glove 12 as illustrated inFIG. 9B. This makes it possible to obtain a configuration substantiallysimilar to that of the medical tool for fingertip 1F having a gloveshape illustrated in FIG. 7. According to this medical tool forfingertip 1H, the medical tool for fingertip of the present inventioncan be configured by using the commonly used surgical glove 12 at alower cost. Further, the method of using the sticker-like medical toolfor fingertip 1H may involve directly attaching the resin layer 10having a ring shape to the ball of the finger and then putting thesurgical glove 12 on the finger over the resin layer 10. This caneliminate the risk of the resin layer 10 having a ring shape beingpeeled off in the body during the palpation.

A medical tool for fingertip 1I illustrated in FIG. 10A is asticker-like medical tool for fingertip in which the resin layer 10having a ring shape in the medical tool for fingertip 1H illustrated inFIG. 9A is changed to a circular resin layer 13. This medical tool forfingertip 1I is also released from the release film 11 and the circularresin layer 13 is attached to the surgical glove 12 as illustrated inFIG. 10B. This makes it possible to obtain a configuration substantiallysimilar to that of the medical tool for fingertip 1G having a gloveshape illustrated in FIG. 8. A method of using the sticker-like medicaltool for fingertip 1I may involve directly attaching the circular resinlayer 13 to the ball of the finger and then putting the surgical glove12 on the finger over the resin layer 13 to eliminate the risk of thecircular resin layer 13 being peeled off in the body.

In a case of the sticker-like medical tools for fingertip of the presentinvention such as the medical tools for fingertip 1H and 1I describedabove, the resin layers 10 and 13 as a part to be placed on the fingeris preferably as thin and flexible as a surgical glove so as not tocause troubles in palpation using the fingertip to which thesticker-like medical tool for fingertip is attached. Thus, it ispreferable that the resin layer as a part to be placed on the finger hasa thickness of from 0.1 to 0.3 mm, and also has a tensile force at breakof 9.0 N or more, an elongation at break of 600% or more, and a tensileforce at 300% elongation of 3.0 N or less, similarly to the physicalproperties of a surgical glove defined by JIS T9107.

The features of the medical tools for fingertip of the present inventiondescribed above can be appropriately combined with one another. Forexample, the medical tools for fingertip 1C and 1D having a finger cotshape illustrated in FIG. 4 and FIG. 5, respectively, may be providedwith the pull string 3.

EXAMPLES

Hereinafter, the present invention will be described specifically basedon Example.

A dye containing a condensed ring structure described in WO2016/132596was kneaded in an ABS resin to produce a medical tool for fingertip 1Ahaving a finger cot shape with a thickness of 2 mm illustrated inFIG. 1. This medical tool for fingertip 1A was put on a finger. FIG. 11Ashows an image of the medical tool for fingertip 1A put on the fingercaptured using white illumination light.

The medical tool for fingertip put on the finger was placed behind asilicone sheet (thickness of 3 mm) 14 imitating a human tissue and animage was captured from the front surface of the silicone sheet 14 underthe white illumination light using a digital color camera. This image isshown in FIG. 11B.

Further, excitation light (wavelength of from 740 to 760 nm) was appliedfrom the front surface of the silicone sheet 14 and an image of thefront surface was captured by a near-infrared color camera system(MIZUHO Corp.). This image is shown in FIG. 11C. As shown in FIG. 11C, adark part corresponding to the opening portion 2 could be observedinside the light-emitting part having a finger cot shape. Thisdemonstrates that the position of the affected site can be specifiedfrom the serosal side by pressing down the affected site on the mucosalside of the body cavity by the ball of the finger exposed from theopening portion 2 of the medical tool for fingertip 1A, followed byapplication of the excitation light.

REFERENCE SIGNS LIST

-   -   1 medical tool main body    -   1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I medical tool for fingertip    -   2 opening portion    -   3 pull string    -   3 a attachment region of pull string    -   4 scales    -   5 holes punched out in a shape of scales    -   6 red or near-infrared light nontransmitting resin film    -   7 glove    -   8 printing layer or resin layer having ring shape    -   9 circular printing layer    -   10 resin layer having ring shape and adhesive layer provided to        one surface    -   11 release film    -   12 surgical glove    -   13 circular resin layer having adhesive layer provided to one        surface    -   14 silicone sheet    -   15 resin without fluorescence dye    -   h1 length    -   w1 width

1. A medical tool for fingertip, which is used by putting it on afingertip, comprising a resin layer that emits red fluorescence ornear-infrared fluorescence.
 2. The medical tool for fingertip accordingto claim 1, wherein the medical tool for fingertip has a finger cotshape and an opening portion from which a ball of a finger is exposedwhen the medical tool is put on the finger, and the resin layer isformed of a resin that emits red fluorescence or near-infraredfluorescence.
 3. The medical tool for fingertip according to claim 2,having a length so that the medical tool covers the finger from thefingertip to a second joint of the finger when the medical tool is puton the finger, the medical tool being provided with scales from theopening portion to a finger insertion side, the scales being formed of ared or near-infrared light nontransmitting resin.
 4. The medical toolfor fingertip according to claim 2, having a length so that the medicaltool covers the finger from the fingertip to a second joint of thefinger when the medical tool is put on the finger, the medical toolhaving a red or near-infrared light nontransmitting resin layer from theopening portion to a finger insertion side, wherein the red ornear-infrared light nontransmitting resin layer has holes from which theresin that emits red fluorescence or near-infrared fluorescence isexposed, and the holes are formed in a shape of scales.
 5. The medicaltool for fingertip according to claim 2, having the resin layer thatemits red fluorescence or near-infrared fluorescence around the openingportion.
 6. The medical tool for fingertip according to claim 2, whereina pull string is attached.
 7. The medical tool for fingertip accordingto claim 1, wherein the medical tool has a globe shape, and has theresin layer that emits red fluorescence or near-infrared fluorescence onor around a ball of a finger thereof.
 8. The medical tool for fingertipaccording to claim 1, wherein the medical tool has a sticker-likemedical tool having an adhesive layer provided to one surface of theresin layer that emits red fluorescence or near-infrared fluorescence,and has a size that allows it to be attached to a ball of a finger. 9.The medical tool for fingertip according to claim 8, wherein the resinlayer as a part to be placed on the finger has a thickness of from 0.1to 0.3 mm.
 10. The medical tool for fingertip according to claim 8,having an opening portion with a width of from 5 to 15 mm and a lengthof from 5 to 20 mm.
 11. A medical tool for palpation, which is used byputting it on a fingertip, comprising a resin layer that emits redfluorescence or near-infrared fluorescence.
 12. The medical tool forfingertip according to claim 3, wherein a pull string is attached. 13.The medical tool for fingertip according to claim 4, wherein a pullstring is attached.
 14. The medical tool for fingertip according toclaim 9, having an opening portion with a width of from 5 to 15 mm and alength of from 5 to 20 mm.